CHNS/O Analyzer

Instrument details:
Type: CHNS/O Analyzer
Make: Perkin Elmer
Model No: 2400 Series II
Essential specification:
Measurement range: Analytical Range : C-0.001-3.6 mgs; H- 0.001-1.0 mgs ;N- 0.001-6.0 mgs, S-0.001-2.0 mgs; O -0.001-2.0 m
Temperature range: Combustion Furnace Temp.-100 – 1100 ˚C; Reduction Furnace Temp-100 – 1000 ˚C; Pyrolysis Furnace Temp-100 – 1100 ˚C; Sample Temp - ≥1800 ˚C
Separation technique: Frontal Chromatography
Detector: 11TCD (Thermal Conductivity Detector)
Gas requirement: Carrier Gas -Helium or Argon ;Combustion Gas -Oxygen; Pyrolysis Gas-5-8% H in He; Pneumatic Gas -Air, Nitrogen or Argon
Minimum sample volume: 1 to 500 mg
Accuracy: ≤0.3%
Precision: ≤0.2%
Working principle:
The elemental analyzer is a device used for quantitative determination in organic samples containing carbon, hydrogen, nitrogen, sulfur and oxygen as the basic elements of nature. The basic operating principle of the device is based on the burning of the sample at high temperature (≥1100º C). The gaseous sample is sent to the chromatography column with an inert gas (helium, He) used as the carrier. Here, the gaseous sample is combusted with oxygen (O2) gas and passed through the oxidation zone followed by oxidation with suitable catalysts to fully perform the quantitative combustion process. After the process, C, H, N, S elements are converted to CO2, H2O, N2 and SO2 gases and sent to the thermal conductivity detector to record the electrical signal proportional to the amount of each gas. This electrical signal then gives, for example, the percentage of elemental composition in proportion to the curve areas obtained in the spectrum. In the determination of the oxygen element, the sample is pyrolyzed by hydrogen-helium (H2-He) gas mixture. All oxygen-containing products formed as a result of combustion are converted to carbon monoxide by the catalyst system and similarly elemental determination is made.